MICROLITER DIVER TECHNIQUE 



357 



Type 1 Pipette. This form of pipette (Fig. 122) is intended for 

 measuring dilute aqueous solutions, particularly for neck seals. The 

 pipettes are drawn from thermometer tubing having a bore of 0.2- 

 0.3 mm. The tubing is heated and the capillary widened into a bulb 



Fig. 120. Clamp stand for divers. From Holier (1943) 



having a wall thickness about half the diameter of the bulb. A 

 slight pull is applied to give the shape in A, Figure 122. At the 

 point indicated by the arrow, heat is applied with a micro flame 

 and the tubing is pulled out to give the pipette {B, Fig. 122). The 



